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Published on: May 17, 2024
Paraneoplastic neurological disorders
Franz Blaes1, Marlene Tschernatsch
1Department of Neurology, Justus-Liebig-University, Am Steg 14, 35385 Giessen, Germany. Franz.Blaes@neuro.med.uni-giessen.de
Abstract:
The article provides an overview on the diagnosis and pathogenesis of paraneoplastic neurological disorders (PNDs), and subsequently the current therapeutic strategies in these patients. PNDs are nervous system dysfunctions in cancer patients, which are not due to a local effect of the tumor or its metastases. Most of these clinically defined syndromes in adults are associated with lung cancer, especially small-cell lung cancer, lymphoma and gynecological tumors. In a part of the PND, an overlapping of different clinical syndromes can be observed. Highly specific autoantibodies directed against onconeuronal antigens led to the current hypothesis of an autoimmune pathophysiology. Whereas the most central nervous PNDs are more T-cell-mediated, limbic encephalitis can be caused by pathogenic receptor autoantibodies. The PND of the neuromuscular junction and paraneoplastic autonomic neuropathy are mainly associated with receptor or ion channel autoantibodies. The childhood opsoclonus-myoclonus syndrome and the PNDs associated with receptor/ion channel autoantibodies often respond to immunosuppressive therapies, plasmapheresis and intravenous immunoglobulins. By contrast, most CNS PNDs associated with defined antineuronal antibodies directed against intracellular antigens only stabilize after tumor treatment.
Insights
Paraneoplastic neurological disorders (PNDs) involve nervous system dysfunction in cancer patients, often linked to specific autoantibodies. Treatment effectiveness varies based on PND type and antibody targets, with some responding to immunotherapy and others requiring tumor treatment.
Area of Science:
- Neurology
- Oncology
- Immunology
Background:
- Paraneoplastic neurological disorders (PNDs) are nervous system dysfunctions in cancer patients not caused by direct tumor effects.
- PNDs are frequently associated with lung cancer, lymphoma, and gynecological tumors.
- Overlapping clinical syndromes can occur within PNDs.
Purpose of the Study:
- To provide an overview of the diagnosis and pathogenesis of PNDs.
- To discuss current therapeutic strategies for patients with PNDs.
- To explore the autoimmune pathophysiology of PNDs.
Main Methods:
- Review of existing literature on PND diagnosis, pathogenesis, and treatment.
- Analysis of the role of autoantibodies in PND development.
- Categorization of PNDs based on affected neurological sites and associated autoantibodies.
Main Results:
- PNDs are hypothesized to have an autoimmune pathophysiology, driven by autoantibodies against onconeuronal antigens.
- Central nervous system PNDs can be T-cell-mediated or caused by receptor autoantibodies (e.g., limbic encephalitis).
- Neuromuscular junction PNDs and autonomic neuropathies involve receptor or ion channel autoantibodies.
Conclusions:
- Childhood opsoclonus-myoclonus syndrome and PNDs with receptor/ion channel autoantibodies may respond to immunosuppression, plasmapheresis, and IVIg.
- Central nervous system PNDs associated with intracellular antigen autoantibodies often require tumor treatment for stabilization.
- Understanding the specific autoantibody targets is crucial for guiding PND treatment strategies.
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